<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <p><strong>hello</strong></p>

    <ul>
        <li><strong>world</strong></li>
    </ul>
</body>

<style>
    p strong{
        color: red;
    }

    ul li strong{
        color: blue;
    }

</style>
</html>